package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     * @throws IOException
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws Exception {
        //file为临时文件
        log.info(file.toString());

        //判断basePath是否存在
        File dir = new File(basePath);
        //如果不存在就创建
        if(!dir.exists()){
            dir.mkdirs();//创建目录
        }
        //生产UUID唯一文件名
        String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));//获取文件后缀  .jpg
       String filename =UUID.randomUUID().toString()+suffix;

        //将临时文件持久化到目录中
        file.transferTo(new File(basePath+filename));
        return R.success(filename);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     * @throws Exception
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws Exception {
        //将服务器的文件以流的形式响应
        //输入流：读文件
        FileInputStream is = new FileInputStream(basePath+name);
        //输出流
        ServletOutputStream os = response.getOutputStream();
        //工具类：输入流和输出流对接
        IOUtils.copy(is, os);
        is.close();
    }
}
